How much coffee is too much to drink a day?

"Most people would agree that if you drink a lot of coffee, you might feel jittery, irritable or perhaps even nauseous", said co-author Elina Hyppönen, director of the Australian Centre for Precision Health, in a press release.

So no, there's no reason to completely cut out coffee, but it is smart to pay attention to how much you're really drinking.

The study, based on UK Biobank data of 347,077 participants aged between 37 and 73 years old, was a bid to understand if some of us are more resilient to coffee's effects than others.

So as to keep up a strong heart and a sound circulatory strain, people must restrain their coffee less than six glasses per day, analysts said.

It's a question Dr Labos has addressed before, in an op-ed for the Montreal Gazette in 2014, in which he broke down various studies on the risks of caffeine after the FDA issued a warning about caffeine consumption.

Speaking to The Sunday Times, Astrid Nehlig, a research director at France's National Institute of Health, said: "It is hard to calculate, but my feeling is that drinking coffee possibly adds another couple of years to your life".

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